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Date: Wed, 23 Mar 2022 12:14:19 -0700 From: syzbot <syzbot+12babd2d45fac8bfff7d@...kaller.appspotmail.com> To: ast@...nel.org, daniel@...earbox.net, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] bpf-next boot error: KASAN: null-ptr-deref Write in register_btf_kfunc_id_set Hello, syzbot found the following issue on: HEAD commit: a8fee96202e2 libbpf: Avoid NULL deref when initializing ma.. git tree: bpf-next console output: https://syzkaller.appspot.com/x/log.txt?x=1686180b700000 kernel config: https://syzkaller.appspot.com/x/.config?x=820db791969fe863 dashboard link: https://syzkaller.appspot.com/bug?extid=12babd2d45fac8bfff7d compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+12babd2d45fac8bfff7d@...kaller.appspotmail.com usbcore: registered new interface driver snd-usb-audio usbcore: registered new interface driver snd-ua101 usbcore: registered new interface driver snd-usb-usx2y usbcore: registered new interface driver snd-usb-us122l usbcore: registered new interface driver snd-usb-caiaq usbcore: registered new interface driver snd-usb-6fire usbcore: registered new interface driver snd-usb-hiface usbcore: registered new interface driver snd-bcd2000 usbcore: registered new interface driver snd_usb_pod usbcore: registered new interface driver snd_usb_podhd usbcore: registered new interface driver snd_usb_toneport usbcore: registered new interface driver snd_usb_variax drop_monitor: Initializing network drop monitor service NET: Registered PF_LLC protocol family GACT probability on Mirror/redirect action on Simple TC action Loaded netem: version 1.3 u32 classifier Performance counters on input device check on Actions configured nf_conntrack_irc: failed to register helpers nf_conntrack_sane: failed to register helpers nf_conntrack_sip: failed to register helpers xt_time: kernel timezone is -0000 IPVS: Registered protocols (TCP, UDP, SCTP, AH, ESP) IPVS: Connection hash table configured (size=4096, memory=64Kbytes) IPVS: ipvs loaded. IPVS: [rr] scheduler registered. IPVS: [wrr] scheduler registered. IPVS: [lc] scheduler registered. IPVS: [wlc] scheduler registered. IPVS: [fo] scheduler registered. IPVS: [ovf] scheduler registered. IPVS: [lblc] scheduler registered. IPVS: [lblcr] scheduler registered. IPVS: [dh] scheduler registered. IPVS: [sh] scheduler registered. IPVS: [mh] scheduler registered. IPVS: [sed] scheduler registered. IPVS: [nq] scheduler registered. IPVS: [twos] scheduler registered. IPVS: [sip] pe registered. ipip: IPv4 and MPLS over IPv4 tunneling driver gre: GRE over IPv4 demultiplexor driver ip_gre: GRE over IPv4 tunneling driver IPv4 over IPsec tunneling driver ipt_CLUSTERIP: ClusterIP Version 0.8 loaded successfully ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: null-ptr-deref in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline] BUG: KASAN: null-ptr-deref in __refcount_add include/linux/refcount.h:193 [inline] BUG: KASAN: null-ptr-deref in __refcount_inc include/linux/refcount.h:250 [inline] BUG: KASAN: null-ptr-deref in refcount_inc include/linux/refcount.h:267 [inline] BUG: KASAN: null-ptr-deref in btf_get kernel/bpf/btf.c:1636 [inline] BUG: KASAN: null-ptr-deref in btf_get_module_btf kernel/bpf/btf.c:6588 [inline] BUG: KASAN: null-ptr-deref in register_btf_kfunc_id_set+0x99/0x8b0 kernel/bpf/btf.c:6812 Write of size 4 at addr 0000000000000054 by task swapper/0/1 CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.17.0-rc6-syzkaller-02045-ga8fee96202e2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 __kasan_report mm/kasan/report.c:446 [inline] kasan_report.cold+0x66/0xdf mm/kasan/report.c:459 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] btf_get kernel/bpf/btf.c:1636 [inline] btf_get_module_btf kernel/bpf/btf.c:6588 [inline] register_btf_kfunc_id_set+0x99/0x8b0 kernel/bpf/btf.c:6812 bbr_register+0x18/0x48 net/ipv4/tcp_bbr.c:1183 do_one_initcall+0x103/0x650 init/main.c:1302 do_initcall_level init/main.c:1375 [inline] do_initcalls init/main.c:1391 [inline] do_basic_setup init/main.c:1410 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1615 kernel_init+0x1a/0x1d0 init/main.c:1504 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 1 Comm: swapper/0 Tainted: G B 5.17.0-rc6-syzkaller-02045-ga8fee96202e2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 panic+0x2b0/0x6dd kernel/panic.c:233 end_report.cold+0x63/0x6f mm/kasan/report.c:128 __kasan_report mm/kasan/report.c:449 [inline] kasan_report.cold+0x71/0xdf mm/kasan/report.c:459 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] btf_get kernel/bpf/btf.c:1636 [inline] btf_get_module_btf kernel/bpf/btf.c:6588 [inline] register_btf_kfunc_id_set+0x99/0x8b0 kernel/bpf/btf.c:6812 bbr_register+0x18/0x48 net/ipv4/tcp_bbr.c:1183 do_one_initcall+0x103/0x650 init/main.c:1302 do_initcall_level init/main.c:1375 [inline] do_initcalls init/main.c:1391 [inline] do_basic_setup init/main.c:1410 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1615 kernel_init+0x1a/0x1d0 init/main.c:1504 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> Kernel Offset: disabled Rebooting in 86400 seconds.. --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
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